U.S. patent application number 15/373000 was filed with the patent office on 2017-06-15 for sandwich type fingerprint recognition device.
The applicant listed for this patent is CentraLED Technology Co., Ltd.. Invention is credited to Ching-Cherng SUN, Liang-Zhu YU, Yeh-Wei YU.
Application Number | 20170169274 15/373000 |
Document ID | / |
Family ID | 59019912 |
Filed Date | 2017-06-15 |
United States Patent
Application |
20170169274 |
Kind Code |
A1 |
SUN; Ching-Cherng ; et
al. |
June 15, 2017 |
SANDWICH TYPE FINGERPRINT RECOGNITION DEVICE
Abstract
The present invention discloses sandwich type fingerprint
recognition devices, one embodiment of the sandwich type
fingerprint recognition device includes a first transparent layer,
a spatial filter layer with multiple through holes, a second
transparent layer and an optical sensor. Another embodiment of the
sandwich type fingerprint recognition device includes a first
transparent layer, a spatial filter layer with multiple through
holes and an optical sensor. With the implementation of the present
invention, complex production process or equipment are not required
for producing fingerprint recognition device that reduce costs; the
size of the fingerprint recognition device is reduced; a variety of
thickness choices for the first transparent layer or second
transparent layer and a variety of colors can be used and more
applications are thus possible; and the contrast of fingerprint
signal is enhanced to enable clarifying fingerprint features and
characteristics and thus recognition accuracy of fingerprints.
Inventors: |
SUN; Ching-Cherng; (Taoyuan,
TW) ; YU; Yeh-Wei; (Taoyuan, TW) ; YU;
Liang-Zhu; (Taoyuan, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CentraLED Technology Co., Ltd. |
Taoyuan |
|
TW |
|
|
Family ID: |
59019912 |
Appl. No.: |
15/373000 |
Filed: |
December 8, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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62309504 |
Mar 17, 2016 |
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62309515 |
Mar 17, 2016 |
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62265467 |
Dec 10, 2015 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G06K 9/0004 20130101;
G06K 9/00087 20130101 |
International
Class: |
G06K 9/00 20060101
G06K009/00 |
Claims
1. A sandwich type fingerprint recognition device, being a
multi-layer structure used to sense or recognize a fingerprint,
comprising: a first transparent layer, being made of light
transmitting substance, includes an upper surface and a lower
surface opposite to the upper surface, wherein the thickness of the
first transparent layer is in the range from 1 micrometer to 800
micrometer; a filter layer, being formed on the lower surface; and
an optical sensor, being fixedly provided beside the filter layer
in a way that the filter layer being in between the first
transparent layer and the optical sensor.
2. A sandwich type fingerprint recognition device, being a
multi-layer structure used to sense or recognize a fingerprint,
comprising: a first transparent layer, being made of light
transmitting substance, includes an upper surface and a lower
surface opposite to the upper surface, wherein the thickness of the
first transparent layer is in the range from 1 micrometer to 800
micrometer; a filter layer, being formed on the lower surface; a
second transparent layer, being formed on the filter layer in a way
that the filter layer being sandwiched in between the first
transparent layer and the second transparent layer; and an optical
sensor, being fixedly provided beside the second transparent
layer.
3. A sandwich type fingerprint recognition device, being a
multi-layer structure used to sense or recognize a fingerprint,
comprising: a first transparent layer, being made of light
transmitting substance, includes an upper surface and a lower
surface opposite to the upper surface, wherein the thickness of the
first transparent layer is in the range from 1 micrometer to 800
micrometer; a filter layer, being formed on the upper surface; and
an optical sensor, being fixedly provided beside the lower
surface.
4. The sandwich type fingerprint recognition device of claim 1,
wherein the fingerprint being in touch with the upper surface of
the first transparent layer.
5. The sandwich type fingerprint recognition device of claim 2,
wherein the fingerprint being in touch with the upper surface of
the first transparent layer.
6. The sandwich type fingerprint recognition device of claim 2,
wherein the fingerprint being in touch with the filter layer.
7. The sandwich type fingerprint recognition device of claim 2,
wherein the thickness of the second transparent layer is in the
range from 1 micrometer to 800 micrometer.
8. The sandwich type fingerprint recognition device of claim 1,
wherein a pillar layer is further formed in between the filter
layer and the optical sensor, wherein the pillar layer being formed
by plural hollow cylinders, and the spacing between any two of the
hollow cylinders is filled with non-transparent filler
material.
9. The sandwich type fingerprint recognition device of claim 2,
wherein a pillar layer is further formed in between the second
transparent layer and the optical sensor, wherein the pillar layer
being formed by plural hollow cylinders, and the spacing between
any two of the hollow cylinders is filled with non-transparent
filler material.
10. The sandwich type fingerprint recognition device of claim 3,
wherein a pillar layer is further formed in between the first
transparent layer and the optical sensor, wherein the pillar layer
being formed by plural hollow cylinders, and the spacing between
any two of the hollow cylinders is filled with non-transparent
filler material.
11. The sandwich type fingerprint recognition device of claim 1,
wherein the filter layer is being a colored layer.
12. The sandwich type fingerprint recognition device of claim 2,
wherein the filter layer is being a colored layer.
13. The sandwich type fingerprint recognition device of claim 3,
wherein the filter layer is being a colored layer.
14. The sandwich type fingerprint recognition device of claim 1,
wherein the filter layer is being a spatial filter layer which
being an optical film, plural microstructures or a light blocking
layer with plural perforated holes.
15. The sandwich type fingerprint recognition device of claim 2,
wherein the filter layer is being a spatial filter layer which
being an optical film, plural microstructures or a light blocking
layer with plural perforated holes.
16. The sandwich type fingerprint recognition device of claim 3,
wherein the filter layer is being a spatial filter layer which
being an optical film, plural microstructures or a light blocking
layer with plural perforated holes.
17. The sandwich type fingerprint recognition device of claim 1,
wherein the filter layer is being a colored layer combined with a
spatial filter layer, wherein the spatial filter layer being an
optical film, plural microstructures or a light blocking layer with
plural perforated holes.
18. The sandwich type fingerprint recognition device of claim 2,
wherein the filter layer is being a colored layer combined with a
spatial filter layer, wherein the spatial filter layer being an
optical film, plural microstructures or a light blocking layer with
plural perforated holes.
19. The sandwich type fingerprint recognition device of claim 3,
wherein the filter layer is being a colored layer combined with a
spatial filter layer, wherein the spatial filter layer being an
optical film, plural microstructures or a light blocking layer with
plural perforated holes.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Technical Field
[0002] The present invention relates to fingerprint recognition
devices, and more particularly to sandwich type fingerprint
recognition devices.
[0003] 2. Description of Related Art
[0004] Traditional optical fingerprint recognition system or device
uses an imaging system to acquire the image of fingerprint. Due to
the bulk size of traditional device or system, positive lens can be
adopted to commence imaging in the imaging system.
[0005] However, as the increasingly widespread of the fingerprint
recognition system or device to handheld or portable devices that
is relatively small in size, the space reserved for fingerprint
recognition system or device becomes quite small.
[0006] Therefore, when adopting fingerprint recognition system or
device to apparatus relatively small, positive lens imaging method
cannot be applied due to such physical limitation.
[0007] It is therefore highly desirable to have the development of
a thin type, high imaging quality fingerprint recognition device
with multi-layer spatial filter and pillar structure to apply in
limited space in thin or small size portable or mini devices or
smart handheld devices.
BRIEF SUMMARY OF THE INVENTION
[0008] The present invention discloses sandwich type fingerprint
recognition devices, one embodiment of the sandwich type
fingerprint recognition device includes a first transparent layer,
a spatial filter layer with multiple through holes, a second
transparent layer and an optical sensor. Another embodiment of the
sandwich type fingerprint recognition device includes a first
transparent layer, a spatial filter layer with multiple through
holes and an optical sensor. With the implementation of the present
invention, complex production process or equipment are not required
for producing fingerprint recognition device that reduce costs; the
size of the fingerprint recognition device is reduced; a variety of
thickness choices for cover glass (first transparent layer or
second transparent layer); a variety of colors can be used and more
applications are thus possible; and the contrast of fingerprint
signal is enhanced to enable clarifying fingerprint features and
characteristics and thus recognition accuracy of fingerprints.
[0009] The present invention provides a sandwich type fingerprint
recognition device, being a multi-layer structure used to sense or
recognize a fingerprint, comprising: a first transparent layer,
being made of light transmitting substance, includes an upper
surface and a lower surface opposite to the upper surface, wherein
the thickness of the first transparent layer is in the range from 1
micrometer to 800 micrometer; a filter layer, being formed on the
lower surface; and an optical sensor, being fixedly provided beside
the filter layer in a way that the filter layer being in between
the first transparent layer and the optical sensor.
[0010] The present invention provides another sandwich type
fingerprint recognition device, being a multi-layer structure used
to sense or recognize a fingerprint, comprising: a first
transparent layer, being made of light transmitting substance,
includes an upper surface and a lower surface opposite to the upper
surface, wherein the thickness of the first transparent layer is in
the range from 1 micrometer to 800 micrometer; a filter layer,
being formed on the lower surface; a second transparent layer,
being formed on the filter layer in a way that the filter layer
being sandwiched in between the first transparent layer and the
second transparent layer; and an optical sensor, being fixedly
provided beside the second transparent layer.
[0011] The present invention provides another sandwich type
fingerprint recognition device, being a multi-layer structure used
to sense or recognize a fingerprint, comprising: a first
transparent layer, being made of light transmitting substance,
includes an upper surface and a lower surface opposite to the upper
surface, wherein the thickness of the first transparent layer is in
the range from 1 micrometer to 800 micrometer; a filter layer,
being formed on the upper surface; and an optical sensor, being
fixedly provided beside the lower surface.
[0012] Implementation of the present invention at least provides
the following advantageous effects:
[0013] 1. Structure simplicity to ensure ease of manufacturing and
to reduce manufacturing costs.
[0014] 2. Reduction of space occupation enabling further
applications.
[0015] 3. Provides high resolution and accurate fingerprint
recognition
[0016] 4. Applicable to filling of material or materials of a
variety of colors.
[0017] 5. Capable of enhancing the contrast of fingerprint
signal.
[0018] 6. Capable of enhancing the discrimination of
characteristics of fingerprint signal and preventing false
recognition.
[0019] The features and advantages of the present invention are
detailed hereinafter with reference to the preferred embodiments.
The detailed description is intended to enable a person skilled in
the art to gain insight into the technical contents disclosed
herein and implement the present invention accordingly. In
particular, a person skilled in the art can easily understand the
objects and advantages of the present invention by referring to the
disclosure of the specification, the claims, and the accompanying
drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0020] The invention as well as a preferred mode of use, further
objectives and advantages thereof will be best understood by
reference to the following detailed description of illustrative
embodiments when read in conjunction with the accompanying
drawings, wherein:
[0021] FIG. 1 is a structural perspective view of a sandwich type
fingerprint recognition device in an embodiment of the present
invention.
[0022] FIG. 2 is a structural perspective view of a sandwich type
fingerprint recognition device in another embodiment of the present
invention.
[0023] FIG. 3 is a structural perspective view of a sandwich type
fingerprint recognition device in still another embodiment of the
present invention.
[0024] FIG. 4A is a longitudinal perspective section view of a
filter layer in an embodiment of the present invention.
[0025] FIG. 4B is a lateral perspective section view of a filter
layer in an embodiment of the present invention.
[0026] FIG. 5 is a sectional perspective view of the optical sensor
being not in contact with the filter layer in the embodiment of
FIG. 1.
[0027] FIG. 6 is a sectional perspective view of the optical sensor
being not in contact with the second transparent layer in the
embodiment of FIG. 2.
[0028] FIG. 7 is a sectional perspective view of the optical sensor
being not in contact with the first transparent layer in the
embodiment of FIG. 3.
[0029] FIG. 8 is a structural perspective view of a sandwich type
fingerprint recognition device further comprises a pillar layer in
an embodiment of the present invention.
[0030] FIG. 9 is a structural perspective view of a sandwich type
fingerprint recognition device further comprises a pillar layer in
another embodiment of the present invention.
[0031] FIG. 10A is a structural perspective view of a filter layer
in an embodiment of the present invention.
[0032] FIG. 10B is a structural perspective view of a filter layer
in another embodiment of the present invention.
[0033] FIG. 10C is a structural perspective view of a filter layer
in still another embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0034] Please refer to FIG. 1, an embodiment of a sandwich type
fingerprint recognition device 100 comprises: a first transparent
layer 10, a filter layer 20 and an optical sensor 30.
[0035] As shown in FIG. 2 is another sandwich type fingerprint
recognition device 200, which comprises: a first transparent layer
10, a filter layer 20, a second transparent layer 50 and an optical
sensor 30.
[0036] Further shown in FIG. 3 is still another sandwich type
fingerprint recognition device 300, which comprises: a first
transparent layer 10, a filter layer 20 and an optical sensor
30.
[0037] As shown in FIG. 1 to FIG. 3, the first transparent layer 10
of the sandwich type fingerprint recognition device 100, or of the
sandwich type fingerprint recognition device 200, or of the
sandwich type fingerprint recognition device 300 can be a
transparent plate or film made of glass or any material or
materials transparent to light in visible frequency region,
infrared frequency region or ultraviolet frequency region.
[0038] In applications of finger print recognition or detection,
the thickness of the first transparent layer 10 can be chosen in
the range from 1 .mu.m to 800 .mu.m.
[0039] As shown in FIG. 1 and FIG. 2, when in actual detection of
fingerprint 800, the finger of a user with the fingerprint 800 to
be detected or recognized or processed rests on the first
transparent layer 10. The light reflected from at least one ridge
portion 801 and at least one valley portion 802 of the fingerprint
800 passes through the first transparent layer 10 and reaches the
filter layer 20 to be then modulated by the filter layer 20.
[0040] As shown in FIG. 3, while applying the sandwich type
fingerprint recognition device 300, the finger of a user with the
fingerprint 800 to be detected or recognized or processed rests on
the first transparent layer 10 touching the filter layer 20, the
light reflected from the ridge portion 801 and the valley portion
802 of the fingerprint 800 first being modulated by the filter
layer 20 and then passes through the first transparent layer
10.
[0041] As shown in FIG. 1 to FIG. 3, the filter layer 10 of the
sandwich type fingerprint recognition device 100, or of the
sandwich type fingerprint recognition device 200, or of the
sandwich type fingerprint recognition device 300 being used as a
spatial filter that modulates incident light, which is the light
signal reflected from the fingerprint 800, to suppress, isolate or
reflect oblique incident portion of the incident light and enhance
the contrast of the light signal.
[0042] As shown in FIG. 1 to FIG. 4B, the aforesaid filter layer 20
can be an optical film, plural microstructures or light blocking
layer 20' with plural through holes 21.
[0043] Referring to FIG. 4A and FIG. 4B, when light blocking layer
20' with plural through holes 21 is used as the filter layer 20,
only the light signal incidents to the through holes 21 will pass,
other part of the light blocking layer 20' blocks light signal in
visible frequency region, infrared frequency region or ultraviolet
frequency region.
[0044] In embodiments, transparent material or materials can be
filled in the through holes 21 to make the filter layer 20 better
endurable while the light still passes through the through holes
21. And on the other hand, the diameter of any of the through holes
21 can be made to be larger than 2 .mu.m, or in between 2 .mu.m and
100 .mu.m.
[0045] Further, the surface of the filter layer 20 with through
holes 21 can also be a light reflecting surface that reflects large
angle oblique incident light to reduce its intensity of passing
through the filter layer 20, thus reduces noise signal and enhance
the contrast of the light signal reflected by fingerprint 800 and
received by the optical sensor 50 in sandwich type fingerprint
recognition device 100, sandwich type fingerprint recognition
device 200 or sandwich type fingerprint recognition device 300.
[0046] And hence, the scattering of reflected light signal by
fingerprint 800 that generates blur effect in the optical sensor 50
is reduced or even eliminated.
[0047] As shown in FIG. 2, FIG. 4A and FIG. 4B, the light blocking
layer 20' can be formed of colored structure of a specific color or
specific colors with the effect that color of the overall
appearance when observed from top of the sandwich type fingerprint
recognition device 100, sandwich type fingerprint recognition
device 200 or sandwich type fingerprint recognition device 300 is
being changed or modified according to various applications.
[0048] Please refer to FIG. 2, the second transparent layer 50 can
also be a transparent plate or film made of glass or any material
or materials transparent to light in visible frequency region,
infrared frequency region or ultraviolet frequency region.
[0049] The second transparent layer 50 is implemented attached to
the filter layer 20 making the filter layer 20 being sandwiched
between the second transparent layer 50 and the first transparent
layer 10.
[0050] As for the thickness of the second transparent layer 50, it
can also be chosen to be in the range from 1 .mu.m to 800
.mu.m.
[0051] With continuous reference to FIG. 1 to FIG. 3, optical
sensor 30 is formed or implemented in under the first transparent
layer 10 or under the filter layer 20, or under the sandwich
structure of first transparent layer 10, the filter layer 20 and
the second transparent layer 50.
[0052] The optical sensor 30 shown in FIG. 1 to FIG. 3 is used to
receive the light signal reflected from at least one ridge portion
801 and at least one valley portion 802 of the fingerprint 800 that
passes through the first transparent layer 10 and the filter layer
20 or the first transparent layer 10 and the filter layer 20 and
the second transparent layer 50, and then generates a pattern light
signal of the fingerprint 800 for post processing.
[0053] Further, the aforesaid optical sensor 30 can be composed of
at least one optical sensor chip.
[0054] Please refer to FIG. 5 to FIG. 7, the optical sensor 30 can
be implemented to not being in contact with the filter layer 20 of
the sandwich type fingerprint recognition device 100 or the second
transparent layer 50 of the sandwich type fingerprint recognition
device 200 or the lower surface 12 of the sandwich type fingerprint
recognition device 300.
[0055] As shown in FIG. 8, a pillar layer 40 is further formed in
between the second transparent layer 50 and the optical sensor 30
of the sandwich type fingerprint recognition device 200.
[0056] Wherein the pillar layer 40 can be formed by plural hollow
cylinders 41, and the spacing between any two of the hollow
cylinders 41 is filled with non-transparent filler material 42 with
the effect that the light signal incident to the pillar layer 40 is
blocked by the non-transparent filler material 42 and passes only
through the hollow cylinders 41, large angle oblique incident light
is thus further reduced in intensity or blocked that the contrast
of the fingerprint light signal is further enhanced.
[0057] Then as shown in FIG. 9, a pillar layer 40 can further be
formed in between the first transparent layer 10 and the optical
sensor 30 of the sandwich type fingerprint recognition device
300.
[0058] Again, the pillar layer 40 being formed by plural hollow
cylinders 41, and the spacing between any two of the hollow
cylinders 41 is filled with non-transparent filler material 42 with
the effect that the light signal incident to the pillar layer 40 is
blocked by the non-transparent filler material 42 and passes only
through the hollow cylinders 41, large angle oblique incident light
is thus further reduced in intensity or blocked that the contrast
of the fingerprint light signal is further enhanced.
[0059] Further, transparent material or materials can be filled
inside the hollow cylinders 41 as shown in FIG. 8 and FIG. 9 to
make the hollow cylinders 41 better endurable while the light can
still pass through, wherein the diameter of any of the hollow
cylinders 41 can be made larger than 2 .mu.m or in between 2 .mu.m
and 100 .mu.m.
[0060] All in all, with the implementation of the filter layer 20
in sandwich type fingerprint recognition device 100, sandwich type
fingerprint recognition device 200 or sandwich type fingerprint
recognition device 300, large angle oblique incident light is
reduced in intensity or isolated to greatly enhance the contrast of
the fingerprint light signal and thus being capable of enhancing
the discrimination of characteristics of fingerprint signal and
preventing false recognition.
[0061] Further with the implementation of the pillar layer 40, the
benefit is further strengthened and the contrast of the fingerprint
light signal in sandwich type fingerprint recognition device 200 or
sandwich type fingerprint recognition device 300 is further
enhanced.
[0062] Moreover, as shown in FIG. 10A, the aforesaid filter layer
20 in the embodiments can be formed as a colored layer 60 or a
replaceable colored layer 60 that makes sandwich type fingerprint
recognition device 100, sandwich type fingerprint recognition
device 200 or sandwich type fingerprint recognition device 300 even
more widely applicable.
[0063] While as shown in FIG. 10B, the aforesaid filter layer 20
can also be formed as a spatial filter layer 70 which being an
optical film, plural microstructures or a light blocking layer with
plural perforated holes.
[0064] Or as shown in FIG. 10C, the aforesaid filter layer 20 can
also be formed by a said colored layer 60 and a said spatial filter
layer 70 altogether.
[0065] With this and as shown in FIG. 1 to FIG. 3 and FIG. 10A to
FIG. 10C, the filter layer 20, being a colored layer 60, a
replaceable colored layer 60 or a colored layer 60 together with a
spatial filter layer, can be formed or implemented on the first
transparent layer 10, or implemented in between the first
transparent layer 10 and the optical sensor 30, or even implemented
on the first transparent layer 10 and in between the first
transparent layer 10 and the optical sensor 30 at the same time,
provides the benefit of enhancing the contrast of the fingerprint
light signal and thus being capable of enhancing the discrimination
of characteristics of fingerprint signal and preventing false
recognition.
[0066] The embodiments described above are intended only to
demonstrate the technical concept and features of the present
invention so as to enable a person skilled in the art to understand
and implement the contents disclosed herein. It is understood that
the disclosed embodiments are not to limit the scope of the present
invention. Therefore, all equivalent changes or modifications based
on the concept of the present invention should be encompassed by
the appended claims.
* * * * *